(PowerShell) Send and Receive WebSocket Frame

Demonstrates how to send a websocket text frame to a websocket echo server. This example uses Chilkat's websocket test echo server at ws://websockets.chilkat.io/wsChilkatEcho.ashx

Note: The websockets.chilkat.io server imposes the following limitations:
Messages must be 16K or less, and each connection is limited to a max of 16 echoed messages.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$ws = New-Object Chilkat.WebSocket

# For brevity, this example does not check for errors when etablishing the WebSocket connection.
# See Establish WebSocket Connection for more complete sample code for making the connection.

$rest = New-Object Chilkat.Rest
# Connect to websockets.chilkat.io
# IMPORTANT: websockets.chilkat.io accepts frames of up to 16K in size and echoes them back.
# IMPORTANT: The websockets.chilkat.io server imposes the following limitations: 
# ---------- Messages must be 16K or less, and each connection is limited to a max of 16 echoed messages.
$success = $rest.Connect("websockets.chilkat.io",80,$false,$false)
$ws.UseConnection($rest)
$ws.AddClientHeaders()
$responseBodyIgnored = $rest.FullRequestNoBody("GET","/wsChilkatEcho.ashx")
$success = $ws.ValidateServerHandshake()
if ($success -ne $true) {
    $($ws.LastErrorText)
    exit
}

# This example demonstrates sending a frame and receiving a text frame.

# Send a frame containing the string "Hello World!"
# This will be the first and final frame, and therefore this constitutes the entire message.
$finalFrame = $true
$success = $ws.SendFrame("Hello World!",$finalFrame)
if ($success -ne $true) {
    $($ws.LastErrorText)
    exit
}

# Read an incoming frame.
$success = $ws.ReadFrame()
if ($success -ne $true) {
    $("Failed to receive a frame")
    $("ReadFrame fail reason = " + $ws.ReadFrameFailReason)
    $($ws.LastErrorText)
    exit
}

# Show the string that was received.
$receivedStr = $ws.GetFrameData()
$("Received: " + $receivedStr)

# Close the websocket connection.
$success = $ws.SendClose($true,1000,"Closing this websocket.")
if ($success -ne $true) {
    $($ws.LastErrorText)
    exit
}

# Read the Close response.
$success = $ws.ReadFrame()
if ($success -ne $true) {
    $("ReadFrame fail reason = " + $ws.ReadFrameFailReason)
    $($ws.LastErrorText)
    exit
}

# Should receive the "Close" opcode.
$("Received opcode: " + $ws.FrameOpcode)
# Should be the same status code we sent (1000)
$("Received close status code: " + $ws.CloseStatusCode)
# The server may echo the close reason.  If not, this will be empty.
$("Echoed close reason: " + $ws.CloseReason)

$("Success.")